Carton having a plastic lining made by deep-drawing



May 12,1970 I R. M. DILOT 3,511,423

CARTON HAVING A PLASTIC LININC MADE BY DEEP-DRAWING Filed Nov. 4,- 19685 Sheets-Sheet 1 Ma 12, 1970 'R. M. DlLOT 7 3,511,428

. CARTON HAVING A PLASTIC LINING MADE BY DEEP-DRAWING Filed Nov. &, 19683 Sheets-Sheet 2 3 Sheets-Sheet 5 R. M.' DlLOT Fig.

May 12, 1970 CARTON" HAVING A PLASTIC LINING MADE BY DEEP-DRAWING 1Filed Nov. L. 1968 United States Patent O US. Cl. 229-14 Claims ABSTRACTOF THE DISCLOSURE A container and method for making same having an outersleeve with flaps closing the bottom thereof and an inner thermoplasticlining which can be deep-drawn, the flaps having a heat-scalable coatingon the inside surfaces thereof to whichthe base of the plastic lining isadhered.

The present invention relates to a container comprising an outer cartonsleeve and an inner lining of a plastic which can be deep-drawn. Thecontainer according to the invention is characterized in that the cartonsleeve is provided at its lower margin with flaps having on their insidea heat-scalable coating which adheres to the lining.

According to the invention it is possible to start from different cartonstructures known per se and comprising a carton sleeve which is providedat its lower margin with closing flaps. In normal cases these flaps arelocked by means of hooks and slots or by other means, such as glue orother adhesives. They are either locked to each other or to thesleeve-shaped portion proper. According to the invention they areinstead locked to the lining mentioned abov Consequently, the erectingand locking of the carton sleeves is simplified and at the same time avery tight bottom structure is obtained, thanks to the lining.

The invention will be described in greater detail in the following withreference to the accompanying drawings showing an example of a preferredembodiment of the subject matter of the invention.

In the drawings, FIG. 1 shows a blank for a carton sleeve forming partof a container according to the invention, said sleeve being shown in aflat, unfolded state.

FIG. 2 shows the same container in an erected folded state.

FIG. 3 shows a wafer which is meant to be fixed to the top of thecontainer according to FIG. 2.

FIG. 4 shows a section through a corner of the container according toFIG. 2.

FIG. 5, finally, shows a mold which serves as a form for the said cartonsleeve during the deep-drawing of a plastic foil in the said cartonsleeve.

As is shown in FIG. 1, the blank for the carton sleeve shown as anexample comprises four side-wall panels 1 to 4 and one joint panel 5. Atthe top, the carton blank has a longitudinal marginal panel 6 which ismeant to be folded into the carton in order to reinforce its opening. Atthe bottom, the carton blank also has a longitudinal marginal panel 7which is meant to be folded into the carton in the same manner.Extending from the said marginal panel 7 there are two end closing flaps8 and 9 which are meant to be part of the bottom structure of thecontainer.

3,51 1,428 Patented May 12, 1970 As is shown in FIG. 2, the bottom flaps8 and 9 will lie inserted to the container in the finished structure.The finished container furthermore comprises a lining 10 hav' ing aflange 11 deep-drawn direct in the carton sleeve. The said flange hasdiagonally disposed wider tab portions 12. Above the flange 11 there ismeant to be fixed a water of the kind shown in FIG. 3. The dimensions ofthis wafer are adjusted to the wider portions 12 of the flange 11.Consequently, the wafer 13 can easily be gripped at the narrowerportions of the flange 11 when the wafer is to be removed.

As is shown in FIG. 4, the carton blank is provided on its inside with athin coating of a heat-scalable lacquer or the like. Preferably, aheat-scalable vinyl lacquer is used, e.g. a copolymer of polyvinylchloride and polyvinyl acetate. Instead of coating the carton blank onits whole inside with such a lacquer, it is suflicient to coat theinside of the flaps 8 and 9.

FIG. 5, finally, shows a mold 15 which serves as a form for the cartonblank when a plastic lining 10 is deepdrawn down into it. Referencenumeral 16 designates a cylindrical outer portion. The mold furthercomprises a bottom portion 17 having passages 18 which are preferablyconnected to a vacuum source. A supporting portion 19 is used as asupport for the inwardly folded bottom portion. The lining 10 may bedispensed either in the form of a wafer or in the form of a web and isfixed to the top of the mold 15 by means of a fixing ring 20. The lining10 is heat d in an arbitrary manner (not shown or described) e.g. bymeans of radiation heat or with hot air. The deep-drawing may take placeby means of a plunger 21 or simply with the aid of vacuum if thepassages 18 are connected to a vacuum source. Alternatively or as acomplement, compressed air may be supplied to the top of the mold 15.This compressed air may possibly be sup plied through the plunger 21 inpassages not shown.

Thus, the flaps 8 and 9 do not have to overlap each other. Instead theymay lie flush with each other, or else it is possible to have a slotdisposed between them. Due to its inserted position, the bottomstructure is as a matter of fact not exposed to any stresses worthmentioning. If it is desirable to simplify the construction it ispossible to dispense with both the upper marginal panel 6 and the lowermarginal panel 7.

What is claimed is:

1. A container comprising an outer carton sleeve having independentbottom forming flaps, said flaps being provided with heat sealablecoatings on the inner sides thereof and an inner deep drawn, continuouslining of thermoplastic material conforming with the interior surface ofsaid carton sleeve and adhered to the heat sealable coatings on saidindependent bottom forming flaps so that said independent flaps aremaintained in the bottom forming position solely by adherence to saiddeep drawn lining.

2. A container as claimed in claim 1 wherein the inner surface of thewalls of said carton sleeve are provided with a heat sealable coating towhich said deep drawn lining adheres.

3. A container as claimed in claim l wherein said carton sleeve isprovided with marginal panels inwardly folded about the base thereof toprovide a double walled marginal flange.

4. A container as claimed in claim 1 wherein said carton sleeve isprovided with two opposed overlapping bottom forming flaps.

5. A container as claimed in claim 3 wherein said carton sleeve isprovided with marginal panels inwardly folded about the top thereof toprovide reinforcement for the top of the container.

References Cited UNITED STATES PATENTS 2,225,810 12/1940 Waters 206-462,590,221 3/1952 Stevens 156-196 4 2,915,098 12/1959 McKay et 211.3,421,678 1/1969 Thompson et al. 229-3.1

FOREIGN PATENTS 6,704,139 9/1967 Netherlands.

DAVID M. BOCKENEK, Primary Examiner US. Cl. X.R.

